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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f188305ddb4b7ea14749cb4c763214a895a5bc0021d56e7232c7cf776acdf7d' 
  AND token = 'ut5Nx3klDen+qqMvU9SAO1068eygwI9CC8nyC68EFgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}